多室式钢管混凝土T形柱压弯性能分析

对几种新型多室式钢管混凝土T形柱形式,通过有限元方法研究其典型压弯受力性能,考虑多室式布置方式、轴压比、混凝土强度等因素的影响。有限元分析结果与试验结果基本符合,其中将腹板钢材延伸到翼缘内,并在最为薄弱的腹板尖端加厚钢板的多室式布置最为合理。研究发现,随轴压比增大,曲线延性下降,构件正向和负向承载力差距变大。混凝土强度下降时,承载力有小幅下降,构件的延性位移有所增加。

ANALYSIS OF COMPRESS AND BENDING PERFORMANCE OF MULTI-CELL T-SHAPED CONCRETE-FILLED STEEL TUBE

The compress and bending performance of several new types multi-cell T-shaped concrete-filled steel tube are investigated by the finite element method,the effect of multi-cell layout,axial compression ratio,concrete strength and other factors are considered.Finite element results are generally consistent with the experimental results.Results indicate that the most feasible section is the form that extending the web steel to the flange and thickening the steel plate in the weakest web head.As the axial compression ratio increases,the curve ductility decrease and component bearing capacity gap between the positive and negative increase.As strength of concrete falls,the bearing capacity declines a little,and component displacement ductility increase.